Features and Benefits
- Single 3.1 V to 3.5 V Supply
- 14-Bit DAC Resolution and Input Data Width
- 160 MSPS Input Data Rate
- 67.5 MHz Reconstruction Pass Band @ 160 MSPS
- 74 dBc SFDR @ 25 MHz
- 250 mW Power Dissipation; 13 mW with Power-Down Mode
- 48-Lead LQFP Package
- See Data Sheet for Additional Information
The AD9772A is a single-supply, oversampling, 14-bit digital-to-analog converter (DAC) optimized for baseband or IF waveform reconstruction applications requiring exceptional dynamic range. Manufactured on an advanced CMOS process, it integrates a complete, low distortion 14-bit DAC with a 2× digital interpolation filter and clock multiplier. The on-chip PLL clock multiplier provides all the necessary clocks for the digital filter and the 14-bit DAC. A flexible differential clock input allows for a single-ended or differential clock driver for optimum jitter performance.
For baseband applications, the 2× digital interpolation filter provides a low-pass response, thus providing as much as a threefold reduction in the complexity of the analog reconstruction filter. It does so by multiplying the input data rate by a factor of 2 while suppressing the original upper in-band image by more than 73 dB. For direct IF applications, the 2× digital interpolation filter response can be reconfigured to select the upper in-band image (that is, the high-pass response) while suppressing the original baseband image. To increase the signal level of the higher IF images and their pass-band flatness in direct IF applications, the AD9772A also features a zero-stuffing option in which the data following the 2× interpolation filter is upsampled by a factor of 2 by inserting midscale data samples.
The AD9772A can reconstruct full-scale waveforms with band-widths of up to 67.5 MHz while operating at an input data rate of 160 MSPS. The 14-bit DAC provides differential current outputs to support differential or single-ended applications.
A segmented current source architecture is combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance. Matching between the two current outputs ensures enhanced dynamic performance in a differential output configuration. The differential current outputs can be fed into a transformer or a differential op amp topology to obtain a single-ended output voltage using an appropriate resistive load.
The on-chip band gap reference and control amplifier are con-figured for maximum accuracy and flexibility. The AD9772A can be driven by the on-chip reference or by a variety of external reference voltages. The full-scale current of the AD9772A can be adjusted over a 2 mA to 20 mA range, thus providing additional gain-ranging capabilities.
The AD9772A is available in a 48-lead LQFP package and is specified for operation over the industrial temperature range of –40°C to +85°C.
- Communication transmit channel
W-CDMA base stations, multicarrier base stations,
direct IF synthesis, wideband cable systems
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
Documentation & Resources
AN-237: Choosing DACs for Direct Digital Synthesis2/14/2015
AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters (Rev. 0)2/14/2015
AN-642: Coupling a Single-Ended Clock Source to the Differential Clock Input of Third-Generation TxDAC® and TxDAC+® Products (Rev. 0)2/14/2015
AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0)11/9/2007
AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC (Rev. 0)5/21/2007
AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 110/15/2004
AN-137: A Digitally Programmable Gain and Attenuation Amplifier Design9/26/2002
Soft Radio Runs into Hard Standards3/19/2001
Tools & Simulations
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